保留文本文件中指定字符串前面的所有文本（Python）

class ObstetricsText:

    @staticmethod
    def __removeAfterI__(key_text, read_path, save_path):
        """
        # remove text after key_text, including key_text.
        :return:
        """
        list_result = []
        file = open(read_path, encoding="UTF-8")
        for line in file.readlines():
            index = line.find(key_text)
            if index > 0:
                list_result.append(line[0: index])
            else:
                list_result.append(line.replace("\n", ""))
        file2 = open(save_path, 'w', encoding="UTF-8")
        for line in list_result:
            file2.write(line + "\n")
        file.close()
        file2.close()
        print("remove success!")
        print("File path saved is ", save_file)


if __name__ == '__main__':
    read_file = r"C:\Users\Administrator\Desktop\最近工作\实验数据\标准\特征文本后10886.txt"
    save_file = r"C:\Users\Administrator\Desktop\最近工作\实验数据\标准\特征文本后10886_20180501.txt"
    ObstetricsText.__removeAfterI__("诊断：", read_file, save_file)

可能遇到的问题：

• 编码问题
  读取或写入文件可能出现乱码，所以设置好文件编码格式
• 换行符问题
  读取或写入文件时请谨慎处理换行符\n